Liquid fuel burner



b' 25, 1939- I r K. P.,BRACE ETAL 2,167,444

LIQUID FUEL BURNER Filed Jan. 6, 1958 I INVENTORS, KEMPER E B/M c5 BY VICTOR W- KL/ssRflTH ATTORNEYS.

Patented July 25, 1939 LIQUID FUEL BURNER.

Kemper P. Brace and Victor W; Kliesrath, South Bend, Ind., assignors to International Engineering Corporation, Chicago, 111., a corporation of Illinois Application January 6, 1938, Serial No. 183 624 3 Claims. (01. 158-5) This invention relates to liquid fuel burners and more particularly to vaporizing type burners for use with heating furnaces or the like.

The capacity of a vaporizing type burner is 5 limited by the rate at which the oil or other liquid fuel can be vaporized "and this rate is largely dependent upon the rate at which heat can be supplied to the vaporizing nozzle. Since air for combustion must flow through or around the nozzle it has a cooling influence tending to reduce the rate of vaporization.

We have found that the rate of vaporization can be increased by increasing the heating efiect on the nozzle and by reducing the cooling effect of the air supplied for combustion. This latter effect is preferably obtained by heating the air prior to its contact with the nozzle. It is accordingly one of the objects of the invention to provide a liquid fuel burner in'which the rateof vaporization of the fuel is increased to a maximum.

It is another object of the invention to provide a fuel burner for a furnace in which the air for combustion is heated by operation of the furnace prior to contact with the nozzle,

Another object of the invention is to provide a liquid fuel burner in which there is a perforated firebox or shell around the nozzle to increase the heating effect on the nozzle. The fixed size of this shell also in effect provides a firebox of fixed size for and in I a definite relationship to the burner, regardless of the size' and shape of the furnace. the combustible mixture burns in the perforations, and therefore the heat is transferred therefrom to the furnace walls substantially without loss as radiant heat.

Other objects, advantages and novel features of the invention will be apparent from the fol- 40 lowing description when readTgin connection with the accompanying drawing, in which the single I figure is a central section through a furnace having a burner embodying the invention.

The illustrated furnace comprises a jacketed .45 wall It! having a side opening l2 communicating with a substantially cylindrical combustion space It which is connected at its upper end to a flue IS.

The jacketed wall is adapted to contain water or other suitable heat transfer medium to conduct 50 heat to a room or otherspace to be heated.

The burner is constituted by a tube Ill extending substantially horizontally through the opening [2 and sealed therein by a suitable mounting member 20. Air is circulated through the tube by a fan 22 under the control of an adjustable The shell becomes highly heated as emcient combustion conditions. bodiment of the invention has been shown and disc 24- and is forced through a vaporizing nozzle 26 carried by the tube substantially at the vertical center of the furnace combustion space.

'As shown the nozzle comprises a porous refractory block having a series of longitudinalperfo- I rations therethrough and supplied with oil through a pipe 28 from any suitable gravity or pressure supply, all as more particularly disclosed and claimed in the copending application of Kemper P. Brace, Serial No. 145,706 filed June 10 of the fuel by reducing the cooling effect of the 50 air thereby resulting in improved combustion.

In order to increase the heat supplied to the nozzle there is provided according to the invention, and to provide a size and shape of firebox of maximum efiiciency, as explained above, a per- 25 forated spherical shell or firebox 32 secured to the tube l8 substantially concentric with and spaced from the nozzle 26. Since a substantial part of the combustion occurs in the firebox 32 the temperature therein will be very high and a corre- 30 spondingly high heating of the nozzle will be obtained. At the same time the walls of the firebox will be highly heated and will radiate or refiect heat to the nomle.

Due to the high rate of vaporization obtained 35 by the present invention the capacity of the burner is increased to the maximum with highly While one emdescribed in detail it is to beunderstood that various other forms might be devised and it is not intended to limit the scope of the invention to the exact embddiment shown nor otherwise than by the terms ,of the appended claims.

What is claimed is: 1. In combination with a furnace, a liquid fuel burner comprising an elongated ,burner tube projecting into the furnace and terminating in the central portion thereof and adapted to conduct air for combustion into the furnace, a porous vaporizing nozzle carried by said tube having passages therethrough for air, means for supplying liquid fuel to said nozzle so that the fuel will be vaporized by air flowing through said passages, and a perforated shell surrounding the I nozzle and adapted to reflect heat back to the and a perforated substantially spherical shell surrounding the nozzle and adapted to reflect heat back to the nozzle, and heat conducting fins in the tube whereby air supplied to the nozzle will be v heated.

3. A liquid fuel burner comprising an elongated burner tube having an air'inlet opening at one end, a porous vaporizing nozzle at the other end of the tube having passages therethrough for air, means to supply liquid fuel to the nozzle so that the fuel will be vaporized by air flowing through said passages and a substantially spherical perforated shell carried by the tube surrounding and 10 spaced from the nozzle,

KEMPER P. BRACE. VICTOR W. KLIESRATH. 

